Not sure where in MD you're located but this place has a good reputation, as least as far as feeders go:

http://www.hamptonmousery.com/

I have no idea if they sell live or not but maybe if you told them what you're looking for and why you want them, you could work something out. You might also try Hoobly; it's like Craigslist in that it's an on-line classifieds listing but they allow people to list/sell live animals/pets on there and you can narrow your search by state and animal type. Hope that helps. Good luck!